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Books about Erfle:
Managerial Economics (7th Edition) 7th (seventh) by Keat, Paul, Young, Philip K, Erfle, Steve (2013) Hardcover... (2013)
Managerial Economics (7th Edition) by Keat, Paul, Young, Philip K, Erfle, Steve (2013) Hardcover by Paul, Young, Philip K, Erfle, Steve Keat (1011)
Astronomy January 1980 Alien Eyes What Good is an Erfle Observing Mars by Astronomy (1980)
Wiki information Erfle:
Heinrich Erfle was a German optician who spent most of his career at Carl Zeiss. In 1917 he invented the first wide-field eyepieces for telescopes and binoculars. During his short life he developed a number of new designs for telescopes and...